Why timing can affect price
Very early or late pickups can mean a driver starting a shift earlier or finishing later than usual, which some operators reflect in the price. This is more common for pickups in the very early hours than for typical evening flights, and is usually a small fixed addition rather than a variable rate. Confirming the total price at the time you book, including any time-of-day surcharge, avoids surprises.
Ask before you book
Browse airport transfer firms in Milton Keynes and ask whether your pickup time carries any additional charge.